Mouthguard



FIG. 1 is a top plan view of a mouthguard showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a left side elevational view thereof, the right side being a mirror image. 

We claim the ornamental design for a mouthguard, as shown and described. 